https://flutter.dev/docs/get-started/flutter-for/react-native-devs
https://flutter.dev/docs/get-started/flutter-for/web-devs

open ios simulator from terminal

# simulator

$ open -a Simulator

https://flutter.dev/docs/get-started/install/macos#set-up-the-ios-simulator

run ios simulator in spotlight

https://*.com/questions/10379622/how-to-run-iphone-emulator-without-starting-xcode

https://facebook.github.io/react-native/docs/running-on-simulator-ios

https://itnext.io/you-dont-need-gui-or-how-to-control-ios-simulator-from-command-line-bf5cfa60aed2

https://developer.apple.com/library/archive/documentation/IDEs/Conceptual/iOS_Simulator_Guide/GettingStartedwithiOSSimulator/GettingStartedwithiOSSimulator.html

run

https://flutter.dev/docs/get-started/test-drive?tab=terminal#run-the-app-2

# Check that an Android device is running
$ flutter devices

$ flutter run

$ flutter devices

$ flutter run -d all

env

https://flutter.dev/docs/get-started/install/macos#update-your-path

$ which .zshrc
$ which flutter
 
#  edit $HOME/.zshrc

$ cat $HOME/.zshrc
$ vim $HOME/.zshrc
$ code .  $HOME/.zshrc

export PATH="$PATH:[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin"

export PATH=/usr/local/mongodb/bin:$PATH

1.2.1

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

1.5.4

install

https://flutter.dev/docs/get-started/install/macos

upgrade

https://flutter.dev/docs/development/tools/sdk/upgrading

$ flutter channel 

$ flutter upgrade

# stable, beta, dev, and master
$ flutter channel stable

$ flutter upgrade

https://github.com/flutter/flutter/tree/master/examples
https://github.com/flutter/flutter/blob/master/examples/hello_world/lib/main.dart

delete old & rename new

Flutter versions

1. flutter_macos_v1.2.1-stable.zip & 464 MB

2019.03.16

2. flutter_macos_v1.5.4-hotfix.2-stable.zip & 576 MB

2019.06.16

Stable channel

Select from the following scrollable list

Version    Ref    Release Date
v1.5.4-hotfix.2    7a4c334    5/8/2019
v1.2.1    8661d8a    2/27/2019
v1.0.0    5391447    12/5/2018

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demo

// Copyright 2019 xgqfrms

import 'package:flutter/widgets.dart';

void main() => runApp(const Center(child: Text('Hello, world!', textDirection: TextDirection.ltr)));

src

https://github.com/flutter/flutter/blob/master/packages/flutter/lib/widgets.dart

https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/widgets/text.dart
https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/app.dart

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Dart

https://github.com/dart-lang

https://github.com/trending/dart

https://github.com/Solido/awesome-flutter
https://github.com/alibaba/flutter-go

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